Full-scale simulation study of stimulated electromagnetic emissions : the first ten milliseconds

Eliasson, Bengt and Stenflo, Lennart (2010) Full-scale simulation study of stimulated electromagnetic emissions : the first ten milliseconds. Journal of Plasma Physics, 76 (3-4). pp. 369-375. ISSN 0022-3778

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Abstract

A full-scale numerical study is performed of the nonlinear interaction between a large-amplitude electromagnetic wave and the Earth's ionosphere, and of the stimulated electromagnetic emission emerging from the turbulent layer, during the first 10 milliseconds after switch-on of the radio transmitter. The frequency spectra are downshifted in frequency and appear to emerge from a region somewhat below the cutoff of the O mode, which is characterized by Langmuir wave turbulence and localized Langmuir envelopes trapped in ion density cavities. The spectral features of escaping O-mode waves are very similar to those observed in experiments. The frequency components of Z-mode waves, trapped in the region between the O- and Z-mode cutoffs show strongly asymmetric and downshifted spectra.